Sound transmitting apparatus



A. E. COY.

SOUND TRANSMITTING APPARATUS.

APPLICATION FILED SEPT. 14. m4.

Patented June 19, 1917. A

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A. E. coY. SOUND TRANSMITTING APPARATUS.

APPLICATION FILED SEPT- l4, l9l4. I

UNITED STATES PATENT oFEIcE.

A.LBE B II' E. COY, OF CHICAGO, ILLINOIS, ASSIGNOB TO THE MAGNIPHONE COMPANY; A

CORPORATION OF ARIZONA.

SOUND-TRANSMITTING APPARATUS.

Specification of Letters Patent.

Patented June 19, 1917.

' Application flledseptember 14,1914. Serial No. 861.553.

To 'all whom it mag concern:

Be it known that I, ALBERT E. Goat, a citizen of the United States of America, and a resident of Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Sound-Trans mitting A paratus, of which the following is a speci cation.

' This invention'relate's to that class of tele phone apparatus in which means is provided for regulating the intensity and amplitude of the vibrat ons of the diaphragm of the transmitter, and for properly directin the sound waves to such diaphragm wit an elimination of foreign sounds in the vicinity of the instrument. And the present im provement. has for its object to provide an effective structural formation and association of parts whereby the degree or amplitude of the vibrations of the transmitter diaphragm can be readily adjusted to attain the desired intensity, purit and distinctness in the sound transmitte with an elimination or avoldance of loud, harsh. or grating tones in one case, and in the other case 'attam. a dlSiilllOli and effective transmission of softand lowsounds.

In the accompanying drawings Figure 1 is a longitudinal section of a telephone transmitter embodying the present im rove'qents.

'g. 1 is a detail sectional elevation of a modification.

Fig. 2 is a detail elevation of the front.

portion of the diaphragm and its attached accessories. f

Fig. 3 is a similar view of the rear portion of the aforesaid diaphragm and attached accessories.

Fig. 4 is an enlargeddetail longitudinal section of the transmitter.

Fig. 5 is a general elevation illustrating the asociation of the present invention with a local battery and receiver, and adapted for use of persons of defective hearing.

Fig. 6 is an elevation of -the interior of the transmitter casing, the diaphragm and its attached accessories being removed.

Similar reference numerals indicate like parts in the several views.

Referring to the drawings, 1 represents the local battery ada ted for connections with suitable tennina sockets 2 and 3 of the transmitter casing 4; while 5 designates an ordinary receiver having flexible line connections 6 with terminal necks 7 and '8 of the transmitter casing 14. aforesaid; The

parts so associated being adapted for the use of persons with defective hearing.

The transnnttcr casing 1 above referred or'cover 9, the marginal portion of which is formed with a screw-threaded rim whicln screws into a screw-threaded oft'sctof the V waves to the transmitter diaphragm and in the present improvementis provided with an annular outstanding rim 11. the periphery of which is made tapering for the purpose hereinafter stated.

12 desi ates the transmitter diaphragm of any or inary form or construction, pref: erably of the fiat disk form shown.

- 13 designates a cup shaped skeleton head formed with an annular receiving recess for the marginal portion of the diaphragm 12 which is held in place in said recess by amarginal confining ring 14' and suitable binding screws as shown. Said skeleton head 13 in addition to the marginal portionabove mentioned has a centra portion 13 orificed for the passage of the microphone member hereinafter described, with said central portion integrally connected to the marginal portion by a plurality of radial arms 15 as illustrated in Figs. 1, 3, and 4.

16 desi ates a microphone block of carbon or-l' e conducting material, and preferably formed with a peripheral supporting flange 17 at one end as shown. Said microphone block 16 projects through the central orifice of the aforesaid central tion 13' of the skeleton head 13, wit out electrical contact therewith, and is supported in place thereon and in insulated relation thereto, by an interposed washer 18 of insulating material, a binding cap' 19 of The utorcto is of the usual. shallow cup shape shown, a and provided with the usual closure ,di-sk the transmitter diaphragm 12 aforesaid, and said front face of the block is formed with a plurality of cells or recesses 21 for the reception of granules of carbon by which microphone roperties areimparte'd to the structure, and as usual to the present type of transmitters.

22 designates a contact fin er attached to the transmitter casing 4, with its free end bearing against the binding cap 19, aforesaid, and adapted to electrically connect the microphone block 16 with a terminal sleeve 8 of the transmitter casing 4.

23 designates a companion contact finger attached to the transmitter casing 4, with its free end bearing on the mar inal portion of the skeleton head 13 mi adapted to electrically connect the diaphragm 12 with a terminal socket 3 of the transmitter casing}.

he material part of this invention involves in connectlon with the diaphrag'mof the transmitter mechanism above described,

a resilient damper member having bearing contact upon the face of the diaphragm an adjustable thereon in, the area of said contact and with said area increasing from a point of slight vibration of the diaphragm I toward a point of greater vibration thereof,

and in the preferred 'type of theinvention illustrated in Figs. 1, 2, and 4, the adjustability and 'variedlresiliency in the damper member are simultaneously attained by a structural formation and association of parts, as follows:

24'designates. a damper member or finger of resilient plate material attached at one end in fixed relation to a mar 'nal portion or frame of the transmitter d1aphragmfl12 and extending diametrically across said diaphragm as indicated in Fig. 2. I

25 designates a headed adjustable screw having screw threaded bearin in the central portion of the closure dis or cover 9 of the transmitter casing 4, so as to be cap'able of manual adjustment in a len hwise direction. At its inner end, the adJiist'able screw 25 has abutment against the resilient damper finger 24, midway the length of the same, and is adapted inits ad'ustinent to bring'more or less of the free en portion of said damper finger 24 into contact with the diaphragm 12, and with correspondingly more or-less pressure at the point of'the contact. Such action is ada ted to-afiord a very effective and controllab e regulationof the vibration of the diaphragm 12 in actual use. p

In connection with the soundtransmitting apparatus above described, it is preferable to use a sectional and variable sound collecting structure havinga formation as fol.-

28. and 29 are a plurality of open ended ofvarymglmgths and resilient dam havin uniform internal diameters corresponding with the internal diameter of the rim 11 of the. closure connected together by forming the aforesaid rim 11 and an end portion of each shell 28, 29 with ta eringl exteriors 30, and in connection wit sue formation, vformi the opposite end ortions of each shell 28, 29 with correspon ingly tapering or flaring interiors 31, as shown. With the above described construction the outstanding neck 11 the transmitter casing can be used alone as a sound wave conductor where a wide ran e ofthe sound waves are to be collected. ith more restricted ranges of the sound waves-to be collected, either one or the other of the shells 28, 29 will be used in connection with the outstanding neck 11.' And where a still lessrange of sound waves are both of said shells- 28, 29 connection with the outstanding neck 11, aforesaid.

to be collected,

Havin .thusIdescribed my invention,

what I c aim as new andfldesiretosecure-by Letters Patent,-'is

. 1. In a sound transmitter ,of'the type described, the combination --of' 1a diaph damping means adapted-for contact with said diaphragm and adjustable inthe area of said contact with the increasing from a point of slight vibration of the diaphragm toward a ploint of greater vibration thereof, substantia y'as set forth.

its.

2. In a sound transmitter of the de scribed, the combination of a diap damping means ada ted for contact said diaphra and ad ustable from the outer edge o s aid di a hragmtoward the center as ressnre on t e diaphragm is increased, su

stantially as set forth.-

3. In a sound transmitter of the herein described, the'comliination of a t means 'adaptp us phragm, adjustable ed for contact with said.- ragm, a transmitter casin formed'with an annular outstanding n a thumb piece located Within said annular neck for manually operating bstan said adjustable damping means, su tially as set forth. 4. Ina sound transmitter of thetype described, the combination of a diaphragm, finger attached adjacent the margin 0 said iaphragm with its free end adapted for contact with the disd p of said free end ofthe am stantiallyassetforth.

5.1n'as0undtrannnitterofthetypede- 12s 'phragm, and means for changing theloc'e tion and per finger upon the diaphragm, mb- I will be used in 3 4 scribed, the combination of a diaphragm, a of the transmitter and abutting against the 1 resilient damper finger attached ad acent damper finger substantially as set forth.

to the margin of said diaphragm with its Signed at Chicago, Illinois, this 11th day free end adapted for contact with the diaof September, 1914. phragm, and means for regulating the location of and pressure on the point of contact ALBERT Q of said free end of the damper finger upon Witnesses: the diaphragm, the same comprising a K. A. MARTENSEN, temper screw having bearing in the casing A. KEHOE. 

